It's sad time

I have not got any corrupted data yet or lost savegames however one time i lost all due to server issues so i thought i did lost all my progress. When i played JC3 one time.

My Pop-Pop once took out the cartrige of my Gameboy Color when I was taking on the Final Four in Pokemon Yellow... I was immensely upset haha

When I lost films in halo 3

May sound silly for a 40 year old, but mine was a minecraft save on the 360. I went all out and had built houses/mansions at each point it would turn night time, so i was never without shelter. I would expand these houses a little each time i visited and
had 2 story, 3 story houses, fully made with kitchens, bahrooms, weapons rooms, gardens, stables for animals, etc, etc. Lots of time and effort spent.

Then just one fateful day, my save file wouldnt open, or if it did, it would just freeze, or boot me, telling me error occured, blah blah blah. Am trying to recreate it all again on the one...lol

There was a point in the game where it made days and nights go for half an hour each, everything was lagging, it would take a minute to finish eating something or chopping a tree block. But yeah, had to finally accept my world had betrayed me...hahaha

Probably the Halo Reach glitch that deleted your campaign progress, I never played it again. That glitch has never been patched as far as I know.